Electronic timing advance

[HADJIASLANIS ARIS 1260 800]

Bruce,
	I was overwhelmed by the response of these people as to where I
can look, and I will do so the moment I find a bit of time (dont forget
Christmas is over).
But to reply to your question, ideally I would like to find a ready made
unit, small enough to hide in the engine compartment (remember classic
car engine compartments must look "original").
In fact, going back to my electronics engineering years, I can "see"
what I am looking for in the form of a tiny 8751 based PCB with one
optical trigger input and a single transistor driver output emulating a
contact breaker. Add to this a converter to drive the 5 volts chip and
enough EMC protection and presto!!!
Concerning firmware, the necessary code (including watch dog functions
etc.) would easily be small enough to fit the on chip EPROM (or OTP). In
fact the whole thing would look strikingly similar to this "Injector
pulse width monitor" project I have been reading about the last few
weeks here!
Not withstanding my forthcoming search in the web, what I have come
across until now is either too big or too cumbersome or an overkill.

Best regards
Aris
 -----Original Message-----
From: HADJIASLANIS ARIS 1260 800 <aris at exmail.panafon.gr>
To: diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
Date: Sunday, January 17, 1999 6:23 AM
Subject: FW: Electronic timing advance


>The next now is to disable the existing (horrible) centrifugal advance
>mechanism, which is easy.
>However the 3rd is to then need to insert a digital programmable
>ignition advance / retard mapping unit between the optical interruptor
>output and the ignition unit.
>Hmmmm after looking in the WWW for ages I have been unable to locate
>such a unit devoid of other frills or compromises (e.g. just turbo or
>Nitrous Oxide retard which really is quite different from what I need).

Which means?.  You want someone to custom design something for
you?.  Your wanting to design your own?.  Or you need to adjust
what you want, to what's available.  Or dig further for answers.
Maybe use part of a oem ecm, for timing control.
Bruce
>
>My original posting to which you replied most kindly was ...
>"... 3. Feed the optical pick up output to a digital advance / retard
>unit
>implementing a simple, programmable advance curve capable of at least
16
>sites.
>4. Optionally add an imput for a detonation sensor to provide a few
>degrees of detonation induced retard.
>5. The unit should just provide an output emulating a normal contact
>breaker, to drive a separate high energy electronic ignition unit
>(already fitted in my car)...."
>Any ideas will be highly appreciated.
>Regards
>Aris